Finding the Fourth Proportional to 158,557.50, 218,828.79 and 91,489.50

Step by Step Solution

1. Step 1: Write the proportion equation
   158,557.50 : 218,828.79 = 91,489.50 : x
2. Step 2: Convert to fraction form
   158,557.50/218,828.79 = 91,489.50/x
3. Step 3: Cross multiply
   158,557.50x = 218,828.79 × 91,489.50
4. Step 4: Simplify right side
   158,557.50x = 20,020,536,582.71
5. Step 5: Solve for x
   x = 20,020,536,582.71/158,557.50
6. Step 6: Final answer
   x = 126,266.73